A former city welfare worker faces more than four years in the slammer for her role in a massive food-stamp scam that cost taxpayers at least $7 million.

Tori Jackson, 34, of Brooklyn, pleaded guilty this morning to conspiracy to commit mail fraud as part of the four-year scheme inside the Human Resources Administration.

Jackson — who became the third person to plead out in the case — admitted using fake names and Social Security numbers to process applications for food-stamp cards that officials say she later used herself.

As part of her plea bargain with Manhattan federal prosecutors, Jackson also admitted pulling off a second, uncharged rip-off in which she fraudulently obtained $220,000 in child-care benefits.

“This former HRA employee should have safeguarded public funds, instead she squandered them on herself and her co-conspirators,” city Department of Investigation Commissioner Rose Gill Hearn said.

Charges remain pending against alleged mastermind Vanee Sykes, who’s charged with cooking up the food-stamp scam shortly after being hired by HRA in 2006.